Hi all - I have had many clowns and many anemone's - I must confess - I never had a clown host in anything else than my nemmies. Even when I lost my nemmie in Jan 07, the clowns was swimming around "helplessly" looking REALLY lost, even though I had already replaced some corals at the time (softies).... Once I added another anemone - they were already trying to "host" in it even WHILE I still had the anemone in my HAND while placing it in the tank! They went straight for the nemmie, and never left it ever again!
I would say - perhaps contact the MASA member "Anemone" and get Brenda (anemone's) input on this question. She seems to have the most experience so far with anemone's - more than me......
IF I would suggest something, it would be perhaps to increase the lighting, (just add one more white T5, or two at max, if money and space allows), and then go for a quadricolor or bubble-tip anemone, as they seem to be the easiest to keep (as long as you feed it often)...
And also, I am NEARLY sure that the clowns would go for the nemmie then, as it is MUCH more natural for them to host in the nemmie, than it is to host in a coral.
Nowhere in nature do clown-fish host in corals....